Using color-scheme and light-dark() to implement dark mode (#154)

* Lint fixes.

* Implement light-dark().

* Lint css with biome, remove stylelint.

* Biome lint fixes.

* Dark mode adjustments.

* Style bug fixes.

* Colour adjustments.

* Move header and footer styles to base.

* Site header adjustments.

* Removing jQuery and umbrella libs. They where great but not needed anymore.

* Add colorScheme to optionally lock light/dark.

* Update README.

* Biome adjustments.

assets/css/components/_tables.css

@@ -1,8 +1,8 @@
 .zebra-table {
-  --table-cell-padding: .5rem;
+  --table-cell-padding: 0.5rem;
 
   @media (max-width: 666px) {
-    --table-cell-padding: .3rem;
+    --table-cell-padding: 0.3rem;
   }
 
   th,
@@ -30,7 +30,7 @@
 }
 
 .responsive-table {
-  --table-gap: .5rem;
+  --table-gap: 0.5rem;
 
   @media (max-width: 666px) {
     th {